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【简答题】
有两种罕见的家族遗传病，它们的致病基因分别位染色体和性染色体上。一种先天代谢病称为黑尿病（A，a），病人的尿在空气中一段时间后，就会变黑。另一种因缺少珐琅质而牙齿为棕色（B，b）。如图为一家族遗传图谱。（概率要以最简分数的形式表示。） 棕色牙齿是（）染色体、（）性遗传病
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【单选题】在表达英式英语和美式英语区别时,应填入哪个选项? What differences are there ____ the English spoken in the UK and the English spoken in the US?
A.
among
B.
between
C.
beside
D.
with
【单选题】(6.3C)患儿,男,10岁,因外伤后出血不止收住人院,诊断为血友病B,下列检查项目会异常的是
A.
出血时间
B.
凝血时间
C.
血小板计数
D.
白细胞计数
E.
血块回缩试验
【单选题】At first she thought he was joking. It took Jason twenty minutes to convince her that he was .
A.
earnest
B.
genuine
C.
serious
D.
real
【单选题】Before a child can learn a musical instrument he or she first needs to acquire the necessary ______ skills.
A.
perceptive
B.
operative
C.
jeopardous
D.
manipulative
【单选题】At first she thought he was joking. It took Jason twenty minutes to convince her that he was ______.
A.
earnest
B.
real
C.
genuine
D.
serious
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